diff --git a/modules/libpr0n/decoders/nsBMPDecoder.cpp b/modules/libpr0n/decoders/nsBMPDecoder.cpp
index 9ec2339af6a..47ca66e608f 100644
--- a/modules/libpr0n/decoders/nsBMPDecoder.cpp
+++ b/modules/libpr0n/decoders/nsBMPDecoder.cpp
@@ -584,15 +584,12 @@ nsBMPDecoder::WriteInternal(const char* aBuffer, PRUint32 aCount)
     
     const PRUint32 rows = mOldLine - mCurLine;
     if (rows) {
+
+        // Invalidate
         nsIntRect r(0, mBIH.height < 0 ? -mBIH.height - mOldLine : mCurLine,
                     mBIH.width, rows);
+        PostInvalidation(r);
 
-        // Tell the image that its data has been updated
-        rv = mImage->FrameUpdated(0, r); 
-        NS_ENSURE_SUCCESS(rv, rv);
-
-        if (mObserver)
-            mObserver->OnDataAvailable(nsnull, PR_TRUE, &r);
         mOldLine = mCurLine;
     }
 
diff --git a/modules/libpr0n/decoders/nsGIFDecoder2.cpp b/modules/libpr0n/decoders/nsGIFDecoder2.cpp
index 015a8efa88f..3acc2ba6790 100644
--- a/modules/libpr0n/decoders/nsGIFDecoder2.cpp
+++ b/modules/libpr0n/decoders/nsGIFDecoder2.cpp
@@ -163,19 +163,8 @@ nsresult
 nsGIFDecoder2::FlushImageData(PRUint32 fromRow, PRUint32 rows)
 {
   nsIntRect r(mGIFStruct.x_offset, mGIFStruct.y_offset + fromRow, mGIFStruct.width, rows);
+  PostInvalidation(r);
 
-  // Update image  
-  nsresult rv = mImage->FrameUpdated(mGIFStruct.images_decoded, r);
-  if (NS_FAILED(rv)) {
-    return rv;
-  }
-
-  // Offset to the frame position
-  // Only notify observer(s) for first frame
-  if (!mGIFStruct.images_decoded && mObserver) {
-    PRUint32 imgCurFrame = mImage->GetCurrentFrameIndex();
-    mObserver->OnDataAvailable(nsnull, imgCurFrame == PRUint32(mGIFStruct.images_decoded), &r);
-  }
   return NS_OK;
 }
 
@@ -285,22 +274,6 @@ void nsGIFDecoder2::EndGIF(PRBool aSuccess)
 //******************************************************************************
 nsresult nsGIFDecoder2::BeginImageFrame(gfx_depth aDepth)
 {
-  if (!mGIFStruct.images_decoded) {
-    // Send a onetime OnDataAvailable (Display Refresh) for the first frame
-    // if it has a y-axis offset.  Otherwise, the area may never be refreshed
-    // and the placeholder will remain on the screen. (Bug 37589)
-    if (mGIFStruct.y_offset > 0) {
-      PRInt32 imgWidth;
-      mImage->GetWidth(&imgWidth);
-      PRUint32 imgCurFrame = mImage->GetCurrentFrameIndex();
-      nsIntRect r(0, 0, imgWidth, mGIFStruct.y_offset);
-      if (mObserver)
-        mObserver->OnDataAvailable(nsnull,
-                                   imgCurFrame == PRUint32(mGIFStruct.images_decoded),
-                                   &r);
-    }
-  }
-
   PRUint32 imageDataLength;
   nsresult rv;
   gfxASurface::gfxImageFormat format;
@@ -333,6 +306,18 @@ nsresult nsGIFDecoder2::BeginImageFrame(gfx_depth aDepth)
   // Tell the superclass we're starting a frame
   PostFrameStart();
 
+  if (!mGIFStruct.images_decoded) {
+    // Send a onetime invalidation for the first frame if it has a y-axis offset. 
+    // Otherwise, the area may never be refreshed and the placeholder will remain
+    // on the screen. (Bug 37589)
+    if (mGIFStruct.y_offset > 0) {
+      PRInt32 imgWidth;
+      mImage->GetWidth(&imgWidth);
+      nsIntRect r(0, 0, imgWidth, mGIFStruct.y_offset);
+      PostInvalidation(r);
+    }
+  }
+
   mCurrentFrame = mGIFStruct.images_decoded;
   return NS_OK;
 }
@@ -346,19 +331,15 @@ void nsGIFDecoder2::EndImageFrame()
     // Only need to flush first frame
     (void) FlushImageData();
 
-    // If the first frame is smaller in height than the entire image, send a
-    // OnDataAvailable (Display Refresh) for the area it does not have data for.
+    // If the first frame is smaller in height than the entire image, send an
+    // invalidation for the area it does not have data for.
     // This will clear the remaining bits of the placeholder. (Bug 37589)
     const PRUint32 realFrameHeight = mGIFStruct.height + mGIFStruct.y_offset;
     if (realFrameHeight < mGIFStruct.screen_height) {
-      PRUint32 imgCurFrame = mImage->GetCurrentFrameIndex();
       nsIntRect r(0, realFrameHeight,
                   mGIFStruct.screen_width,
                   mGIFStruct.screen_height - realFrameHeight);
-      if (mObserver)
-        mObserver->OnDataAvailable(nsnull,
-                                  imgCurFrame == PRUint32(mGIFStruct.images_decoded),
-                                  &r);
+      PostInvalidation(r);
     }
     // This transparency check is only valid for first frame
     if (mGIFStruct.is_transparent && !mSawTransparency) {
diff --git a/modules/libpr0n/decoders/nsICODecoder.cpp b/modules/libpr0n/decoders/nsICODecoder.cpp
index 338a58e483b..ff1bfc17055 100644
--- a/modules/libpr0n/decoders/nsICODecoder.cpp
+++ b/modules/libpr0n/decoders/nsICODecoder.cpp
@@ -121,14 +121,11 @@ nsICODecoder::FinishInternal()
 
   // Send notifications if appropriate
   if (!IsSizeDecode() && !mError && (GetFrameCount() == 1)) {
-    // Tell the image that it's data has been updated 
+
+    // Invalidate
     nsIntRect r(0, 0, mDirEntry.mWidth, mDirEntry.mHeight);
-    rv = mImage->FrameUpdated(0, r);
+    PostInvalidation(r);
 
-
-    if (mObserver) {
-      mObserver->OnDataAvailable(nsnull, PR_TRUE, &r);
-    }
     PostFrameStop();
     mImage->DecodingComplete();
     if (mObserver) {
diff --git a/modules/libpr0n/decoders/nsIconDecoder.cpp b/modules/libpr0n/decoders/nsIconDecoder.cpp
index f76e973a440..32ca8e52493 100644
--- a/modules/libpr0n/decoders/nsIconDecoder.cpp
+++ b/modules/libpr0n/decoders/nsIconDecoder.cpp
@@ -154,14 +154,8 @@ nsIconDecoder::WriteInternal(const char *aBuffer, PRUint32 aCount)
         // Copy the bytes
         memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
 
-        // Notify
-        rv = mImage->FrameUpdated(0, r);
-        if (NS_FAILED(rv)) {
-          mState = iconStateError;
-          return rv;
-        }
-        if (mObserver)
-          mObserver->OnDataAvailable(nsnull, PR_TRUE, &r);
+        // Invalidate
+        PostInvalidation(r);
 
         // Book Keeping
         aBuffer += bytesToRead;
diff --git a/modules/libpr0n/decoders/nsJPEGDecoder.cpp b/modules/libpr0n/decoders/nsJPEGDecoder.cpp
index 6649dd99443..d78c6b3781d 100644
--- a/modules/libpr0n/decoders/nsJPEGDecoder.cpp
+++ b/modules/libpr0n/decoders/nsJPEGDecoder.cpp
@@ -674,9 +674,7 @@ nsJPEGDecoder::OutputScanlines(PRBool* suspend)
 
   if (top != mInfo.output_scanline) {
       nsIntRect r(0, top, mInfo.output_width, mInfo.output_scanline-top);
-      rv = mImage->FrameUpdated(0, r);
-      if (mObserver)
-        mObserver->OnDataAvailable(nsnull, PR_TRUE, &r);
+      PostInvalidation(r);
   }
 
   return rv;
diff --git a/modules/libpr0n/decoders/nsPNGDecoder.cpp b/modules/libpr0n/decoders/nsPNGDecoder.cpp
index 5550d92843d..1678299dcee 100644
--- a/modules/libpr0n/decoders/nsPNGDecoder.cpp
+++ b/modules/libpr0n/decoders/nsPNGDecoder.cpp
@@ -204,14 +204,7 @@ void nsPNGDecoder::EndImageFrame()
     if (mFrameHasNoAlpha)
       mImage->SetFrameHasNoAlpha(numFrames - 1);
 
-    if (NS_FAILED(mImage->FrameUpdated(numFrames - 1, mFrameRect))) {
-      mError = PR_TRUE;
-      // allow the call out to the observers.
-    }
-    PRUint32 curFrame = mImage->GetCurrentFrameIndex();
-    if (mObserver)
-      mObserver->OnDataAvailable(nsnull, curFrame == numFrames - 1,
-                                 &mFrameRect);
+    PostInvalidation(mFrameRect);
   }
 #endif
 
@@ -809,15 +802,9 @@ nsPNGDecoder::row_callback(png_structp png_ptr, png_bytep new_row,
     PRUint32 numFrames = decoder->mImage->GetNumFrames();
     if (numFrames <= 1) {
       // Only do incremental image display for the first frame
+      // XXXbholley - this check should be handled in the superclass
       nsIntRect r(0, row_num, width, 1);
-      if (NS_FAILED(decoder->mImage->FrameUpdated(numFrames - 1, r))) {
-        decoder->mError = PR_TRUE;  /* bail */
-        return;
-      }
-      PRUint32 curFrame = decoder->mImage->GetCurrentFrameIndex();
-      if (decoder->mObserver)
-        decoder->mObserver->OnDataAvailable(nsnull,
-                                            curFrame == numFrames - 1, &r);
+      decoder->PostInvalidation(r);
     }
   }
 }
diff --git a/modules/libpr0n/src/RasterImage.cpp b/modules/libpr0n/src/RasterImage.cpp
index bff7a18e0b8..b61a549c1e8 100644
--- a/modules/libpr0n/src/RasterImage.cpp
+++ b/modules/libpr0n/src/RasterImage.cpp
@@ -927,7 +927,7 @@ RasterImage::EnsureCleanFrame(PRUint32 aFrameNum, PRInt32 aX, PRInt32 aY,
 }
 
 
-nsresult
+void
 RasterImage::FrameUpdated(PRUint32 aFrameNum, nsIntRect &aUpdatedRect)
 {
   NS_ABORT_IF_FALSE(aFrameNum < mFrames.Length(), "Invalid frame index!");
@@ -936,10 +936,6 @@ RasterImage::FrameUpdated(PRUint32 aFrameNum, nsIntRect &aUpdatedRect)
   NS_ABORT_IF_FALSE(frame, "Calling FrameUpdated on frame that doesn't exist!");
 
   frame->ImageUpdated(aUpdatedRect);
-
-  // XXXbholley - this should turn into a void method as soon the decoders
-  // stop using it
-  return NS_OK;
 }
 
 nsresult
diff --git a/modules/libpr0n/src/RasterImage.h b/modules/libpr0n/src/RasterImage.h
index c808174d112..56db7a2f799 100644
--- a/modules/libpr0n/src/RasterImage.h
+++ b/modules/libpr0n/src/RasterImage.h
@@ -226,7 +226,7 @@ public:
                                PRUint32** paletteData,
                                PRUint32*  paletteLength);
 
-  nsresult FrameUpdated(PRUint32 aFrameNum, nsIntRect& aUpdatedRect);
+  void FrameUpdated(PRUint32 aFrameNum, nsIntRect& aUpdatedRect);
 
   /* notification when the current frame is done decoding */
   nsresult EndFrameDecode(PRUint32 aFrameNum);